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Rashid [163]
3 years ago
7

5(x-2)=3x+4(x+1) can you also explain how you got the answer

Mathematics
1 answer:
ANEK [815]3 years ago
7 0

Answer:

x = -7

Step-by-step explanation:

5(x-2)=3x+4(x+1)

First, multiply the 5 with the x and the 5 with the -2. You are using the distributive property.

5x -10 = 3x + 4 (x+1)

Then multiply the 4 with the x and the 4 with the 1 on the other side. Again, you are using the distributive property.

5x-10=3x+4x+4

Next, combine like terms. So you're going to combine the 3x and the 4x on the right side.

5x-10=7x+4

Then, subtract 5x from both sides. Also, subtract the 4 from both sides. You do this in order to get all of the x's on one side of the equation.

-14 = 2x

Finally, divide 2 from both sides. You do this because right now, the equation says 2 times x, and you need to get the x alone.

-7 = x

You are finished

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3 years ago
A concentric-tube heat exchanger cools hot water owing at 1 kg/s from 80C to 30C. It uses air owing at 5 kg/s to perform this co
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Answer:

The log-mean-temperature-difference is 24.03⁰C

Step-by-step explanation:

First we need to know if the heat exchanger is in parallel flow or counter-flow. However, counter flow arrangement is best used to recover heat.

L.M.T.D for counter flow is given as;

L.M.T.D =\frac{(T_h_f_1 -T_c_f_2)-(T_h_f_2 -T_c_f_1)}{2.3log[\frac{T_h_f_1 -T_c_f_2}{T_h_f_2 -T_c_f_1}]}

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Tcf₂ is the final temperature of the cold fluid = 51.5°C

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Therefore, the log-mean-temperature-difference is 24.03⁰C

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